What's the trick with the JW Fishers Pulse 12?

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	What's the trick with the JW Fishers Pulse 12? « on: January 28, 2009, 11:46:58 am »

Hello,

I would liek to build a boat towed PI Machine but the extreme cable length imposes a problem.

Does anybody know how JW Fishers solved this problem on their Pulse 12?

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http://www.jwfishers.com/p12.htm

You can use this detector with 500' of cablle. However a normal PI design doesn't allow anymore than 10 meters of cable between coil and detector.

Any ideas what's the secret?

Regards,

Christian

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #1 on: January 28, 2009, 12:02:26 pm »

I would split the PI in 2 parts, both with a Microcontroller or Embedded PC inside.
The yellow Thing that looks like a Rocket contains the analog PI Electronics.
The Connection to the Control Unit could be RS232 or LAN - only Digital, no analog Signals.

On the Pulse 12, it looks like the Cable is connected to the Coil, so it seems like
the long Cable does not matter if no early sampling (for small Gold) is needed.

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #2 on: January 28, 2009, 03:33:42 pm »

So do you think that the cable length between controls and and the PI Electronics doesn't matter? I also thought that the cable connecting the coil to the electronics was actually 500 feet long on the Pulse 12 but whomever I had asked said that this was impossible to achieve with a PI design.

Regards,

Christian

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #3 on: January 28, 2009, 03:45:18 pm »

Christian you have to take resistance of the connecting cable in consideration . The resistance will weaken the signal . Remember when you wanted to connect a second TV set two flights up while your inlet was downstairs ? You had to use a Signal Ampifier to get proper reception . The same can be done to amplify your signal comming from your coil . Think about it . Cornelius

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #4 on: January 28, 2009, 03:51:47 pm »

Hello Cornelius,

so you think an signal amplifier circuit could be integrated into an existing PI design to compensate the signal loss?

Regards,

Christian

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #5 on: January 28, 2009, 04:00:21 pm »

Yes Christian it could be done . The only thing is that you have to use the right amplifier ( analog or digital ) . You can put the amplifier halfway in the connecting wires ( watertight in that case ) or you may try it at the end of the connecting wires , and in that case above the waterline . Cornelius

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #6 on: January 29, 2009, 04:52:23 pm »

Hello Everyone , Looking at the website link you posted above , 500 feet looks like the maximum length of cable they sell . You need to find out the type of cable and the exact "wire gauge" size , of the the 500 foot roll of cable they sell you . Is it a single coax or is it a dual coax with ethernet ? These little qustions may help you design what is needed to increase the length of your TOW-CABLE . On the Control box is see three Military or possible Amphenol 5 pin connectors , Meaning it has an input[DATA] from the coil , a possible output[PULSE] to the search coil . The cable seems to be at least one Coax and maybe one data type Ethernet ? I am just guessing . Someone needs to examine the coax . Then we can invent some solutions.........................Regards......... Waveing

..........Eugene52

Finding out about the Cables will also answer what electronics are mounted inside the Towfish !
Posted on: January 28, 2009, 06:45:33 PM

I wonder if anyone has "attempted" to design or test a completely "wireless-underwater metal detector with Tow-Fish Yet ? With the use of very low frequencies to control all fuctions/adjustmants of an underwater towable P.I. ...............I know very little about diving or salvage , but asking questions can sometimes create Great Ideas !! Idea

.......This is a Great Topic maybe we will get some good answers today !!!!....... Waveing

.....Regards.......... Wise

.......Eugene

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #7 on: January 29, 2009, 04:56:13 pm »

So far I have only seen P.I machines hooked to cables , If there is no Diver . And a diver has his depth limits . Unless you own a Deep-Diving submarine Shocked

..................Thanks ...............Eugene

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #8 on: January 29, 2009, 05:23:38 pm »

I'm having a littele PI detector added to this ROV. It will have an approx 30 x 30 cm squre frame coil and will indicated targets through a LED visisble by the camera of the ROV.

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	Re: What's the trick with the JW Fishers Pulse 12? « Reply #9 on: January 31, 2009, 01:36:52 am »

I don't think the Pulse 12 has any electronics in the towfish. I saw one in use several years ago and I don't recall any wire going into the fish. The only cable came straight off the coil. I will email the guy that owns it and see if he can look for a number on the cable.

HH,
Rip

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